multipage tiff support

[kostrom]

I redid this fix and merged your changes, following the contribution and testing guidelines, to see if it passes travis.

[hugovk]

Tip: You don't need to make a PR to get Travis to run the tests.

You also have it running on your own repo: https://travis-ci.org/kostrom/Pillow/

[coveralls]

Changes Unknown when pulling cf1d6a3 on kostrom:master into * on python-pillow:master*.

[kostrom]

@hugo – I was unable to run travis against my repo yesterday. It is authorized and switched on, as far as I can tell, in travis. Only a pull request triggered it.

And my branch didn’t have as good tests as wiredfool tiff-seek, so I thought I needed to redo everything to get all his stuff in and make it pass. Although I should have used all the old git commit notes as well, which I did not.

I really do appreciate the comprehensive test suite. I just am not experienced using it. On the bright side, it is now passing with your help.

[wiredfool]

See #885. I'm thinking that's the final form of this patch, with a reasonably logical commit history and the debug faffing rebased out of it.